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1从一次干旱事件说起2008年11月1日至2009年2月6日,我国北方冬小麦主产区基本未出现一次5mm以上的有效降水,受旱面积达1.5亿亩(1亩=666.7m2),国家防汛抗旱指挥部为此启动了I级抗旱应急响应,2月7日起部分地区下了小雨,2月15日以后有了较大降水,3月2日宣布解除应急响应状态。这次干旱属于50
1 Speaking from a drought event From November 1, 2008 to February 6, 2009, there was basically no more than 5 mm of effective precipitation in the main winter wheat producing areas in northern China, with a drought-affected area of 150 million mu (1 mu = 666.7 m2 ), The State Flood Control and Drought Relief Headquarters initiated a Class I drought response. From February 7, light rain began in some areas, and after December 15, there was more precipitation. On March 2, it announced the state of lifting the emergency response. The drought is 50